When Should You Short Volatility?

"Everyone knows UVXY goes down over time. But does it go down more on certain days? Is there a best day to short it? What about overnight?"

Leveraged and inverse volatility ETFs like UVXY, VXX, and SQQQ are structurally designed to decay. Contango, daily rebalancing, and volatility drag all work against holders. This is why shorting these products has been one of the most popular strategies in the volatility space.

But not all days are equal. We built a tool that breaks down the short volatility trade by day of the week.

Introducing the Weekday Backtester (Short)

The Weekday Backtester (Short) tests short entries on volatility ETFs like UVXY, UVIX, VXX, SQQQ, SOXS, ZSL, and BOIL. Pick a day to short, a day to cover, and see the full historical performance. The logic is inverted: you profit when the ETF drops.

Three Strategy Modes

Multi-Day

Pick a short day and a cover day. The strategy shorts at the short day's open and covers at the cover day's close, one trade per week. Short Monday open, cover Friday close tests a full-week short. Short Tuesday, cover Thursday tests a narrower window. With UVXY, the full-week short has historically returned over 200% annualized.

Intraday

Pick a single day. The strategy shorts at the open and covers at the close on that day only. This isolates which weekday's intraday decline is the steepest. Some days see more aggressive decay than others due to futures roll timing, options expiration effects, and intraday VIX mean reversion patterns.

Overnight

Short at a day's close and cover at the next trading day's open. This captures the overnight gap only. Volatility ETFs frequently gap down at the open because VIX futures tend to settle lower during calm overnight sessions. Friday overnight is particularly interesting because it spans the full weekend: short Friday's close, cover Monday's open.

Hover over any day button in Overnight mode to see the exact trade. Friday shows "Weekend hold. Short Friday at the close, cover Monday at the open."

What You See

• Annualized Return: Strategy vs buy and hold, with the exact difference. Since these ETFs decay, buy and hold is deeply negative, so the comparison shows how much better strategic shorting is versus passive holding.
• Per Trade Stats: Win rate, average trade, best trade, worst trade. Short vol trades tend to have high win rates but occasional large losses during VIX spikes.
• Equity Curve: Strategy (orange) vs buy and hold (gray dashed), starting from $10,000. The contrast is dramatic on decaying products.
• Trade Log: Every trade listed with entry date, exit date, and return. Scan for the losing trades to understand the tail risk.

Find Best Combination

The Find Best Combination button tests every possible day pair (20 combinations in Multi-Day, 5 days in Intraday and Overnight) and surfaces the one with the highest annualized return. The results often reveal that certain day pairs capture most of the weekly decay while avoiding the days when volatility spikes tend to occur.

The Risk Side

The annualized numbers on short volatility strategies look enormous. But the trade log tells the full story. Scroll through the losing trades and you'll find occasional drawdowns of 30% or more in a single trade. These happen during VIX spikes, when the product you're shorting can double or triple in a few days.

The overnight mode is particularly exposed to gap risk. If a geopolitical event or market shock occurs overnight, you're holding a short position through it. Friday overnight adds weekend risk on top of that.

The tool doesn't tell you whether to take these trades. It shows you exactly what happened historically so you can decide for yourself whether the return justifies the risk.